Benthic Nutrients and Physical Water Properties Annual Amplitude in the Australian Region (0.025 grid)

emperature, salinity, oxygen, silicate, phosphate, and nitrate, linearly interpolated from 1/8 degree spaced "high resolution" CARS2000 mean and seasonal fields to a 0.025 degree spaced grid. Values obtained for seafloor by vertical linear interpolation, which is possible because CARS2000 is mapped to one depth level below seafloor by least squares quadratic filter projection of horizontally and vertically adjacent data points. The loess filter used to create CARS2000 resolves at each point a mean value and a sinusoid with 1 year period (and in some cases a 6 month period sinusoid - the "semi-annual cycle".) The provided "annual amplitude" is simply the magnitude of that annual sinusoid.CARS is a set of seasonal maps of temperature, salinity, dissolved oxygen, nitrate, phosphate and silicate, generated using Loess mapping from all available oceanogrpahic data in the region. It covers the region 100-200E, 50-0S, on a 0.5 degree grid, and on 56 standard depth levels. Higher resolution versions are also available for the Australian continental shelf. The data was obtained from the World Ocean Atlas 98 and CSIRO Marine and NIWA archives. It was designed to improve on the Levitus WOA98 Atlas, in the Australian region.

温度、盐度、溶解氧、硅酸盐、磷酸盐与硝酸盐数据，均从1/8度间距的"高分辨率"CARS2000平均场与季节场经线性插值至0.025度间距的网格。海底点位的数值通过垂直线性插值获取，该操作可行的原因是：CARS2000通过对水平与垂直相邻数据点进行最小二乘二次滤波投影，被映射至海底下方一个深度层级。
用于构建CARS2000的局部加权回归平滑滤波器（Loess滤波器）可在每个点位解析出均值与周期为1年的正弦分量，部分场景下还可解析出周期为6个月的正弦分量——即"半年周期循环"。本次提供的"年振幅"即为该年度正弦分量的幅值。
CARS是一套温度、盐度、溶解氧、硝酸盐、磷酸盐与硅酸盐的季节分布图集，基于研究区域内所有可用海洋学数据，通过Loess映射方法生成。其覆盖范围为东经100°至200°、南纬50°至0°，采用0.5度间距网格，包含56个标准深度层。澳大利亚大陆架区域另有更高分辨率版本可供获取。
该数据集的原始数据源自世界海洋图集98（World Ocean Atlas 98）、澳大利亚联邦科学与工业研究组织（CSIRO）海洋档案库以及新西兰国家水与大气研究所（NIWA）档案库。其设计目标是在澳大利亚区域对Levitus发布的WOA98图集进行优化升级。